US5977722A - Device for applying particular voltage waveform for operating a discharge lamp - Google Patents

Device for applying particular voltage waveform for operating a discharge lamp Download PDF

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Publication number
US5977722A
US5977722A US08/913,111 US91311197A US5977722A US 5977722 A US5977722 A US 5977722A US 91311197 A US91311197 A US 91311197A US 5977722 A US5977722 A US 5977722A
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Prior art keywords
discharge lamp
voltage
waveform
maximum peak
operating
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US08/913,111
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Inventor
Yoshihisa Yokokawa
Tatuhiro Hiraoka
Masaki Inoue
Masaki Yoshioka
Tatushi Igarashi
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Ushio Denki KK
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Ushio Denki KK
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/2806—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without electrodes in the vessel, e.g. surface discharge lamps, electrodeless discharge lamps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the invention relates to a device for operating a fluorescent discharge lamp of the outer electrode type which is used for document scanning illumination of an information processing device, such as a fax machine, a copier, an image reader and the like, and for a back light device of a liquid crystal display and for similar purposes.
  • a fluorescent discharge lamp of the outer electrode type is known as a fluorescent lamp which is used for document scanning illumination of an office automation device and for back light of a liquid crystal display of an office automation device and the like.
  • FIG. 12 is a schematic of an arrangement of the above described fluorescent discharge lamp of the outer electrode type.
  • FIG. 12(a) shows a cross section of the fluorescent discharge lamp of the outer electrode type which corresponds to the direction perpendicular to the direction of the tube axis.
  • FIG. 12(b) is a side view hereof.
  • fluorescent discharge lamp of the outer electrode type 1 consists of discharge vessel 3 which consists of a dielectric such as glass or the like, a pair of strip-like or line-like electrodes 2, 2', and layers of fluorescent material 4 which are formed on the inside of discharge vessel 3. Electrodes 2, 2' are located on the side of discharge vessel 3 in the direction of the tube axis roughly over the entire length and consist of aluminum of the like.
  • above described fluorescent discharge lamp of the outer electrode type 1 has been operated by applying a high frequency voltage to the outer electrodes as in a cold cathode fluorescent discharge lamp of the inner electrode type. That is, high frequency main circuit 5 as shown in FIG. 13 is connected to the pair of electrodes 2, 2' of fluorescent discharge lamp of the outer electrode type 1. For example, a waveform high frequency AC voltage according to FIG. 14 is applied to electrodes 2, 2'. In this way a high frequency voltage is applied in the discharge space within discharge vessel 3 which is present between outer electrodes 2, 2' via the side discharge vessel 3, forming a discharge.
  • FIG. 15 schematically shows this strip-like discharge phenomenon.
  • Fluorescent discharge lamp of the outer electrode type 1 shown in FIG. 12 can be called a capacitor which consists of outer electrodes 2, 2' and discharge vessel 3 as the dielectric.
  • the lamp current which is supplied to this fluorescent discharge lamp of the outer electrode type 1 is determined by the magnitude of electrostatic capacity which is formed between outer electrodes 2, 2' and discharge vessel 3 which consists of the dielectric.
  • Current must be supplied to increase the illuminance of fluorescent discharge lamp of the outer electrode type 1 even more. This means that the voltage applied to outer electrodes 2, 2' and the high frequency of the voltage must be increased.
  • the invention is devised to eliminate the above described disadvantage. Therefore the object of the invention is to devise a device for operating a fluorescent discharge lamp of the outer electrode type in which even when the pressure of the filled gas is increased in the discharge vessel a stable discharge can be maintained and in which at the same time higher illuminance can be obtained.
  • a device for operating a fluorescent discharge lamp of the outer electrode type in which within a glass tube at least one of rare gases He, Ne, Ar, Kr or Xe is/are hermetically sealed in a stipulated amount, in which fluorescent material is applied to the inside of the above described glass tube, and in which in the axial direction of the outside of the above described glass tube there are at least two strip-shaped electrodes, operation of the above described discharge lamp is effected by applying a voltage with a periodic waveform, in which with respect to repetition period t of the voltage waveform 2 Wo ⁇ t, if the width at a voltage of the waveform of 0 V which has a single maximum peak value within a period for a periodic waveform of the lamp voltage is labeled Wo.
  • discharge lamp 1 is operated by applying a voltage with a periodic waveform, in which full width at half maximum of a waveform with a maximum peak value at the operating lamp voltage satisfies condition W ⁇ Wx, if with respect to the repetition period t of the voltage waveform 2 Wo ⁇ t, if the width at a voltage of the waveform of 0 V which has a single maximum peak value within one period at the periodic waveform of the lamp voltage is labeled Wo, if furthermore the maximum illuminance is labeled L, which in the case of operation of the above described lamp is obtained by a sine curve, if the same lamp wattage as in this case is supplied under the aforementioned conditions, and if the full width at half maximum of a waveform with a maximum peak value at which the above described illuminance L can be obtained is designated Wx.
  • period t of the periodic voltage waveform is fixed in the range from 5 ⁇ sec to 70 ⁇ sec.
  • a fluorescent discharge lamp of the outer electrode type is operated in which within the glass tube a gas with a partial pressure of the Xe gas of greater than or equal to 80 torr and a total pressure of the filled gas of less than or equal to 760 torr is filled.
  • the arrangement described above in (1) to (7) makes it possible to maintain a stable discharge even when the pressure of the gas filled in the discharge lamp is increased, and to further increase the illuminance more than in the conventional operation method in which the sine curve is applied.
  • FIG. 1 shows a schematic of one arrangement of a basic circuit of the flyback type of one embodiment of the device as claimed in the invention for operating a discharge lamp;
  • FIG. 2 shows a schematic of an arrangement of a circuit of the flyback type of another embodiment of the operation device as claimed in the invention
  • FIG. 3 shows a schematic of a MOSFET circuit intrinsically including one diode
  • FIG. 4 shows a schematic of one arrangement of an experimental circuit of the flyback type which is used in the invention
  • FIG. 5 shows a schematic of the relation between the full width at half maximum and the illuminance of the discharge lamp (with 8 mm diameter);
  • FIG. 6 shows a schematic of the relation between the full width at half maximum and the illuminance of the discharge lamp (with 6.5 mm diameter);
  • FIG. 7(a) through FIG. 7(d) each show one schematic of the lamp voltage waveform in operation of the discharge lamp
  • FIG. 8 shows a schematic of the relation between the lamp wattage and the illuminance with different waveforms
  • FIG. 9 shows a schematic of the relation between the operation period and the illuminance
  • FIG. 10 shows a schematic of the relation between the partial pressure of the Xe gas and relative luminance fluctuation
  • FIG. 11 shows a schematic of the relation between the mixing ratio of Ne and the illuminance
  • FIG. 12(a) shows a schematic cross section of one arrangement of a fluorescent discharge lamp of the outer electrode type
  • FIG. 12(b) shows a schematic side view of the arrangement according to FIG. 12(a);
  • FIG. 13 shows a schematic of a circuit of a conventional operation type using a sine curve high frequency of a fluorescent discharge lamp of the outer electrode type
  • FIG. 14 shows a schematic of a voltage waveform for operation of a conventional fluorescent discharge lamp of the outer electrode type
  • FIG. 15 shows a schematic of a phenomenon of unstable discharge which occurs at a high pressure of the filled gas.
  • FIG. 1 is a schematic of an arrangement of a basic circuit of one embodiment of the device as claimed in the invention for operating fluorescent discharge lamp 1 of the outer electrode type (hereinafter called a discharge lamp). Furthermore, reference number 6 labels a DC source, reference number 7 a driver circuit, reference number 8 a switching device, and reference number 9 a transformer. This figure shows the arrangement of a basic circuit of the flyback type. Switching device 8 is turned on and off by driver signals with a stipulated frequency which is delivered by driver circuit 7. If switching device 8 is turned on by the above described driver signals, current flows via a line from DC source 6 via the primary winding of transformer 9, switching device 8 to ground G, and energy is stored in transformer 9.
  • a discharge lamp the outer electrode type
  • discharge vessel 3 consisting of glass or the like does not in fact act as a dielectric, and thus an approximation to a state is achieved in which a voltage is applied directly to the gas filled inside.
  • the latter in the discharge lamp which is operated via the glass, the latter is a dielectric. If a voltage is applied to the lamp, this glass surface is therefore electrified and discharge begins if a breakdown voltage is achieved. This discharge immediately neutralizes the glass surface and then stops because there is no longer any potential gradient. When the next discharge begins, the glass surface is neutralized again and the discharge stopped in the same way. This process is repeated. This phenomenon arises depending on the condition of the glass surface and the respective electrification condition in each area of the glass surface.
  • the illumination intensity of the ultraviolet radiation which are emitted from the Xe gas of discharge lamp 1 decreases both at an overly high repetition frequency of the above described voltage applied to discharge lamp 1 (called the "operation frequency"), and also at an overly low operation frequency.
  • operation frequency an overly high repetition frequency of the above described voltage applied to discharge lamp 1
  • the operation frequency is reduced with a constant input power, the energy per repetition of the lamp voltage waveform increases according to the reduction of the operation frequency.
  • the radiant efficiency of Xe decreases when the input energy is increased. It is therefore conceivable that the lower the operation frequency is made, the more the radiant efficiency and the illuminance decrease.
  • the illumination intensity does increase up to a certain frequency when the luminous frequency is increased. But if the frequency is increased even more, the next voltage waveform destroys the excitation species which produce the ultraviolet radiation, thus causing the illuminance to decrease.
  • the discharge lamp is operated in a stable emission condition even if the pressure of the filled gas is increased.
  • FIG. 2 is a schematic of an arrangement of a circuit of the flyback type of another embodiment of the operation device as claimed in the invention.
  • diode D is located in series with switching device 8. If for example a MOSFET is used as switching device 8, conventionally with respect to an arrangement between the drain and the source electrode there is diode D1, as is shown in FIG. 3.
  • a MOSFET is used as switching device 8
  • diode D1 conventionally with respect to an arrangement between the drain and the source electrode there is shown in FIG. 3.
  • the circuit shown in FIG. 2 therefore at the instant the input power is turned off on the primary side of transformer 9 an electromotive counterforce is formed, the current flowing in the direction of arrow in FIG. 3 and the radiant efficiency decreasing to a high degree.
  • diode D is series connected to switching device 8 so that the above described current is hindered. Without a decrease of efficiency, this arrangement yields a voltage waveform with above described full width at half maximum within a stipulated value even if switching device 8 which is shown in FIG. 3 and which is provided with diode D1 is used.
  • FIG. 4 is a schematic of one arrangement of an experimental circuit of the flyback type which was used in this embodiment.
  • a MOSFET was used as switching device 8.
  • Diode D was series connected to switching device 8, as was shown in FIG. 2.
  • snubber circuit 10 is connected; it consists of a series connection of resistor R1 of 50 ohms and capacitor C1 of 1000 pF.
  • a 24 V DC source was connected to one of the terminals on the primary side of transformer 9, while switching device 8 was connected to the other terminal via diode D and was supplied with driver signals with a peak value of 12 V, as is shown in the drawing.
  • Capacitor C2 of 440 ⁇ F was connected to the 24 V DC source.
  • Transformer 9 with following properties (1) to (4) was used, the full width at half maximum of the periodic voltage waveform which is formed on the secondary side of transformer 9 having been changed.
  • FIGS. 5 and 6 are schematics of the relation between the full width at half maximum which was obtained in the above described experimental circuit, and the illuminance of the discharge lamp.
  • FIG. 5 a lamp with a tube diameter of 8 mm and a lamp length of 360 mm is used as a discharge lamp; it has two strip-like electrodes (one pair) with an electrode width of 8 mm.
  • FIG. 5 shows the relation between the full width at half maximum and the illuminance during operation of the discharge lamp under conditions A and B described below.
  • the "operation process as claimed in the invention” represents operation using the circuit shown in FIG. 4, while the “conventional process” represents operation of the discharge lamp with a sine curve high frequency AC voltage.
  • Condition B lamp wattage 13 W
  • Operation in the operation process as claimed in the invention was accomplished with a operation frequency of 40 kHz under condition A and with a operation frequency of 70 kHz under condition B.
  • the illumination intensity under conditions A and B is essentially constant, regardless of the value of the full width at half maximum.
  • the illuminance becomes higher according to a reduction of the full width at half maximum.
  • the illuminance at a full width at half maximum of less than 2.8 ⁇ s to 3 ⁇ s becomes higher than in the conventional light operation process.
  • FIG. 6 a lamp with a tube diameter of 6.5 mm and a lamp length of 360 mm is used as a discharge lamp; it has two strip-like electrodes (one pair) with an electrode width of 7 mm.
  • FIG. 6 shows the relation between the full width at half maximum and the illuminance during operation of the discharge lamp under the same condition as above described condition B, i.e., with a lamp wattage of 13 W.
  • the "operation process as claimed in the invention” represents operation using the circuit shown in FIG. 4, while the “conventional operation process” represents operation of the discharge lamp with a sine curve high frequency AC voltage, as in FIG. 5.
  • the operation frequency in the operation process as claimed in the invention was 70 kHz.
  • the lamp wattage for example at a peak voltage of 1400 V was 13.5 W for waveform 1, 12.7 W for waveform 2 and 11.0 W for waveform 3. This corresponds to 1.22 for waveform 1 and 1.14 for waveform 2 if the lamp wattage is designated 1 for waveform 3.
  • These differences of lamp wattage are based on differences of the power which is supplied to the oscillation wave which follows on the maximum peak voltage and which contributes to emission.
  • FIG. 8 schematically shows the relation between the lamp wattage and the illuminance if the above described waveforms 1 through 3 have been applied to the discharge lamp.
  • a lamp with a tube diameter of 8 mm and a lamp length of 360 mm is used as a discharge lamp, the operation frequency being 70 kHz.
  • FIG. 9 is a schematic of the relation between the operation period and the illuminance (lamp wattage is constant: 13 W).
  • the "operation process as claimed in the invention” represents operation using the circuit shown in FIG. 4, while the “conventional operation process” represents luminous operation of the discharge lamp with a sine curve high frequency AC voltage, as in FIG. 5.
  • a discharge lamp with a tube diameter of 8 mm and a lamp length of 360 mm was used.
  • the illuminance decreases in the "operation process as claimed in the invention" when the operation period become longer. For a short operation period the illuminance also decreases.
  • the conceivable reason for this is that at a low operation frequency (for a long operation period) the radiant efficiency and illuminance decrease and that for an overly high operation frequency (for a short operation period) emission with good radiant efficiency from the excitation species cannot take place, as was described above.
  • Relative luminance fluctuation is defined by maximum brightness "a" of the discharge lamp after n minutes have passed since starting of operation of the discharge lamp (the maximum value of brightness on the locations in FIG. 15 at which emission is concentrated) and by minimum brightness b (the maximum value of brightness at the dark locations in FIG. 15), and it can be computed using the following formula:
  • FIG. 10 is a schematic of the relation between the partial pressure of the Xe gas and the relative luminance fluctuation.
  • operation process as claimed in the invention represents operation using the circuit shown in FIG. 4, while the “conventional operation process” represents operation of the discharge lamp with a sine curve, as shown in FIG. 5.
  • a discharge lamp with a tube diameter of 8 mm and a lamp length of 360 mm was used which was operated at lamp wattage of 13 W. Three minutes after starting operation relative luminance fluctuation was determined.
  • the filling pressure of the Xe gas can be set to greater than or equal to 80 torr, at which a stable luminous condition could not be easily maintained in the "conventional operation process” due to high relative luminance fluctuation. As claimed in the invention, this enabled a higher illuminance to be maintained than in the "conventional operation process”.
  • FIG. 11 schematically shows the efficiency of the illuminance when the mixing ratio of Ne gas changes, the Xe gas pressure having been 100 torr using the above described basis of gases.
  • a discharge lamp with a tube diameter of 8 mm, a lamp length of 360 mm, a frequency of 70 kHz and constant lamp wattage of 20 W was used.
  • the efficiency of the illuminance increases when the mixing ratio of the Ne gas is increased as the partial pressure of the Xe gas is kept at 100 torr.
  • the total pressure within the discharge lamp is 500 torr. If however the total pressure of filling in the discharge lamp is greater than or equal to 760 torr, the difficulty arises that when the discharge lamp is produced the lamp expands, making its manufacture difficult. It is therefore desirable that the total pressure of the gas encapsulated in the discharge lamp be less than or equal to 760 torr.
  • the device for operating a discharge lamp can be used for document scanning illumination of an information processing device, such as a fax machine, a copier, an image reader and the like, and for a background light device of a liquid crystal display.

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
US08/913,111 1996-01-16 1997-01-13 Device for applying particular voltage waveform for operating a discharge lamp Expired - Lifetime US5977722A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP8-004499 1996-01-16
JP00449996A JP3277788B2 (ja) 1996-01-16 1996-01-16 放電ランプ点灯装置
PCT/JP1997/000044 WO1997026779A1 (fr) 1996-01-16 1997-01-13 Dispositif d'eclairage de lampe a decharge

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US (1) US5977722A (zh)
EP (1) EP0817542B1 (zh)
JP (1) JP3277788B2 (zh)
KR (1) KR100436884B1 (zh)
CN (1) CN1155298C (zh)
CA (1) CA2215599C (zh)
DE (1) DE69711278T2 (zh)
TW (1) TW344188B (zh)
WO (1) WO1997026779A1 (zh)

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US6172467B1 (en) * 1997-08-12 2001-01-09 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Method and device for producing series of impulse voltages to operate discharge lamps and circuit pertaining thereto
US6225758B1 (en) * 1997-08-12 2001-05-01 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Method for producing impulse voltage sequences to operate discharge lamps and circuit pertaining thereto
US6239559B1 (en) * 1998-01-09 2001-05-29 Ushiodenki Kabushiki Kaisha Light source using dielectric barrier discharge lamp
US6323600B1 (en) * 1997-07-22 2001-11-27 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Process for generating voltage pulse sequences and circuit assembly therefor
US20020180381A1 (en) * 2001-05-25 2002-12-05 Ushiodenki Kabushiki Kaisha Device for operating a dielectric barrier discharge lamp
US6495972B1 (en) 1999-04-30 2002-12-17 Ushiodenki Kabushiki Kaisha Dielectric barrier discharge lamp light source
US6617788B2 (en) * 2000-09-08 2003-09-09 Hitachi, Ltd. Phosphor and display device or light source using the same
WO2007141562A1 (en) * 2006-06-09 2007-12-13 Uv Energy Limited Ballast
US20080106206A1 (en) * 2005-05-02 2008-05-08 Hooke William M Pulsed dielectric barrier discharge
US20090160370A1 (en) * 2007-12-19 2009-06-25 Industrial Technology Research Institute Alternating current light emitting device

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JP3355976B2 (ja) * 1997-02-05 2002-12-09 ウシオ電機株式会社 放電ランプ点灯装置
JP3296284B2 (ja) * 1998-03-12 2002-06-24 ウシオ電機株式会社 誘電体バリア放電ランプ光源装置およびその給電装置
DE19839336A1 (de) 1998-08-28 2000-03-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektronisches Vorschaltgerät für Entladungslampe mit dielektrisch behinderten Entladungen
DE19839329A1 (de) * 1998-08-28 2000-03-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektronisches Vorschaltgerät für Entladungslampe mit dielektrisch behinderten Entladungen
US6369519B1 (en) * 1999-10-18 2002-04-09 Ushiodenki Kabushiki Kaisha Dielectric barrier discharge lamp light source
DE10011484A1 (de) * 2000-03-09 2001-09-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verbessertes Pulsbetriebsverfahren für eine Stille Entladungslampe
JP2002289385A (ja) * 2001-03-23 2002-10-04 Harison Toshiba Lighting Corp 放電灯駆動装置
JP2003036987A (ja) 2001-07-24 2003-02-07 Harison Toshiba Lighting Corp 放電ランプ点灯装置、機器および画像形成装置

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US5072155A (en) * 1989-05-22 1991-12-10 Mitsubishi Denki Kabushiki Kaisha Rare gas discharge fluorescent lamp device
US5173642A (en) * 1990-06-06 1992-12-22 Mitsubishi Denki Kabushiki Kaisha Rare gas discharge fluorescent lamp device
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US5637965A (en) * 1995-10-18 1997-06-10 Matsushita Electric Works R&D Laboratory, Inc. Low pressure sodium-mercury lamp yielding substantially white light

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6323600B1 (en) * 1997-07-22 2001-11-27 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Process for generating voltage pulse sequences and circuit assembly therefor
US6225758B1 (en) * 1997-08-12 2001-05-01 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Method for producing impulse voltage sequences to operate discharge lamps and circuit pertaining thereto
US6172467B1 (en) * 1997-08-12 2001-01-09 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Method and device for producing series of impulse voltages to operate discharge lamps and circuit pertaining thereto
US6239559B1 (en) * 1998-01-09 2001-05-29 Ushiodenki Kabushiki Kaisha Light source using dielectric barrier discharge lamp
US6495972B1 (en) 1999-04-30 2002-12-17 Ushiodenki Kabushiki Kaisha Dielectric barrier discharge lamp light source
US6617788B2 (en) * 2000-09-08 2003-09-09 Hitachi, Ltd. Phosphor and display device or light source using the same
US20020180381A1 (en) * 2001-05-25 2002-12-05 Ushiodenki Kabushiki Kaisha Device for operating a dielectric barrier discharge lamp
US6788008B2 (en) * 2001-05-25 2004-09-07 Ushiodenki Kabushiki Kaisha Device for operating a dielectric barrier discharge lamp
US20080106206A1 (en) * 2005-05-02 2008-05-08 Hooke William M Pulsed dielectric barrier discharge
US7615933B2 (en) * 2005-05-02 2009-11-10 International Technology Center Pulsed dielectric barrier discharge
US8344627B1 (en) 2005-05-02 2013-01-01 International Technology Center Pulsed dielectric barrier discharge
WO2007141562A1 (en) * 2006-06-09 2007-12-13 Uv Energy Limited Ballast
US20090160370A1 (en) * 2007-12-19 2009-06-25 Industrial Technology Research Institute Alternating current light emitting device
US8598799B2 (en) * 2007-12-19 2013-12-03 Epistar Corporation Alternating current light emitting device
US9501992B2 (en) 2007-12-19 2016-11-22 Epistar Corporation Alternating current light emitting device

Also Published As

Publication number Publication date
JPH09199285A (ja) 1997-07-31
CA2215599C (en) 2002-05-21
JP3277788B2 (ja) 2002-04-22
EP0817542B1 (en) 2002-03-27
EP0817542A4 (en) 1998-04-29
DE69711278T2 (de) 2002-11-21
KR19980703026A (ko) 1998-09-05
CA2215599A1 (en) 1997-07-24
EP0817542A1 (en) 1998-01-07
CN1178062A (zh) 1998-04-01
TW344188B (en) 1998-11-01
DE69711278D1 (de) 2002-05-02
CN1155298C (zh) 2004-06-23
KR100436884B1 (ko) 2004-08-11
WO1997026779A1 (fr) 1997-07-24

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